The applicable steam conditions for large-capacity fossil-fuel thermal power plants over 500 MW in Japan have conventionally been 246 kgf/cm²G and 538/566°C. Mitsubishi Heavy Industries, Ltd.(MHI) has established, through wide-scale development programs, the technologies for design and materials of steam turbines with steam temperature 593°C, and has applied the steam conditions of 246 kgf/cm²G and 538/593°C to the large-capacity 700 MW turbine, Hekinan No.3 Unit for Chubu Electric Power Co., Inc. According to our further development of high-temperature design, MHI has successfully developed and manufactured the 1 000 MW turbine, Matsuura No.2 Unit, Electric Power Development Co., Ltd. With a steam condition of 600°C class main steam and reheating steam temperature for the first time in the world. The unit, that was first rolled with steam in January 1997, has been put to successful test run and various other tests, before starting commercial operation in July 1997. This paper describes the features of design and operating experience of the Matuura No.2 Unit.